Mr. Pierre Gouriou Profile

Pierre Gouriou

Doctoral Candidate at PhLAM Lab

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Publications (5)

Proceedings Article | 9 June 2017 Presentation

Latest developments on fibered MOPA in mJ range with hollow-core fiber beam delivery and fiber beam shaping used as seeder for large scale laser facilities (Conference Presentation)

Jean-François Gleyze, Florent Scol, Arnaud Perrin, Pierre Gouriou, Constance Valentin, Géraud Bouwmans, Emmanuel Hugonnot

Proceedings Volume 10238, 102380J (2017) https://doi.org/10.1117/12.2264577

KEYWORDS: Laser applications, Amplitude modulation, Fiber lasers, Beam shaping, Fiber amplifiers, Beam delivery, Fusion energy, Optical amplifiers, Frequency modulation, Plasma physics

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The Laser Megajoule (LMJ) is a French large scale laser facility dedicated to inertial fusion and plasma physics research. LMJ front-ends are based on fiber laser technology at nanojoule range [1]. Scaling the energy of those fiber seeders to the millijoule range is a way to upgrade LMJ’s front ends architecture and could also be used as seeder for lasers for ELI project for example. However, required performances are so restrictive (optical-signal-to-noise ratio higher than 50 dB, temporally-shaped nanosecond pulses and spatial single-mode top-hat beam output) that such fiber systems are very tricky to build. High-energy fiber amplifiers In 2015, we have demonstrated, an all-fiber MOPA prototype able to produce a millijoule seeder, but unfortunately not 100% conform for all LMJ’s performances. A major difficulty was to manage the frequency modulation used to avoid stimulated Brillouin scattering, to amplitude modulation (FM-AM) conversion, this limits the energy at 170µJ. For upgrading the energy to the millijoule range, it’s necessary to use an amplifier with a larger core fiber. However, this fiber must still be flexible; polarization maintaining and exhibit a strictly single-mode behaviour. We are thus developing a new amplifier architecture based on an Yb-doped tapered fiber: its core diameter is from a narrow input to a wide output (MFD 8 to 26 µm). A S² measurement on a 2,5m long tapered fiber rolled-up on 22 cm diameter confirmed that this original geometry allows obtaining strictly single-mode behaviour. In a 1 kHz repetition rate regime, we already obtain 750 µJ pulses, and we are on the way to mJ, respecting LMJ performances. Beam delivery In LMJ architecture the distance between the nanojoule fiber seeder and the amplifier stages is about 16 m. Beam delivery is achieved with a standard PM fiber, such a solution is no longer achievable with hundreds of kilowatt peak powers. An efficient way to minimize nonlinear effects is to use hollow-core (HC) fibers. The comparison between the different fibers will be presented in the conference. Fiber spatial beam shaping Spatial beam shaping (top-hat profile) is mandatory to optimize the energy extraction in free-space amplifier. It would be very interesting to obtain a flat-top beam in an all-fiber way. Accordingly, we have design and realize a large mode area single-mode top-hat fiber able to deliver a coherent top-hat beam. This fiber, with larger MFD adapted to mJ pulse, will be implemented to perform the spatial beam shaping from coherent Gaussian profile to coherent top-hat intensity profile in the mJ range. In conclusion, we will present an all-fiber MOPA built to fulfil stringent requirements for large scale laser facility seeding. We have already achieved 750 µJ with 10 ns square pulses. Transport of high peak power pulses over 17 m in a hollow-core fiber has been achieved and points out FM to AM conversion management issues. Moreover, spatial beam shaping is obtained by using specifically designed single-mode fibers. Various optimizations are currently under progress and will be presented.

Proceedings Article | 9 May 2017 Presentation

mJ range all-fiber MOPA prototype with hollow-core fiber beam delivery designed for large scale laser facilities seeding (Conference Presentation)

Florent Scol, Pierre Gouriou, Arnaud Perrin, Jean-François Gleyze, Constance Valentin, Géraud Bouwmans, Emmanuel Hugonnot

Proceedings Volume 10083, 1008304 (2017) https://doi.org/10.1117/12.2250321

KEYWORDS: Laser applications, Amplifiers, Gaussian beams, Beam shaping, Prototyping, Fiber lasers, Frequency modulation, Amplitude modulation, Fusion energy, Beam delivery

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Proceedings Article | 27 April 2016 Paper

First realization of a birefringent flat-top single-mode fiber

C. Valentin, P. Gouriou, F. Scol, B. Sevigny, Y. Quiquempois, L. Bigot, R. Habert, A. Cassez, O. Vanvincq, E. Hugonnot, G. Bouwmans

Proceedings Volume 9886, 988615 (2016) https://doi.org/10.1117/12.2227616

KEYWORDS: Polarization, Single mode fibers, Birefringence, Cladding, Refractive index, Near field, Fermium

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Proceedings Article | 11 March 2016 Paper

Top hat single-mode polarization maintaining fiber and polarizing numerical design

Pierre Gouriou, Florent Scol, Benoit Sevigny, Constance Valentin, Yves Quiquempois, Laurent Bigot, Rémi Habert, Andy Cassez, Olivier Vanvincq, Emmanuel Hugonnot, Geraud Bouwmans

Proceedings Volume 9728, 97281A (2016) https://doi.org/10.1117/12.2209521

KEYWORDS: Fiber lasers, Laser processing, Laser applications, Laser tissue interaction, Polarization, Birefringence, Fermium, Boron, Silica, Single mode fibers

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Proceedings Article | 12 May 2015 Paper

Industrial mJ-class all-fiber front end with spatially coherent top-hat beam output used as seeder for high power laser

Jean-François Gleyze, A. Perrin, Pierre Calvet, Pierre Gouriou, Florent Scol, Constance Valentin, Géraud Bouwmans, E. Lecren, Emmanuel Hugonnot

Proceedings Volume 9513, 95130C (2015) https://doi.org/10.1117/12.2178484

KEYWORDS: Optical amplifiers, Fiber amplifiers, Fiber lasers, High power lasers, Beam shaping, Fusion energy, High power fiber amplifiers, Laser applications, Polarization, Bragg cells

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